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4.7 Euro air pump bypass belt size?

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Old 07-12-2017, 09:50 PM
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Erik N
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Default 4.7 Euro air pump bypass belt size?

On the road up in Idaho, my air pump seized. Looking for the belt to connect the main pulley to the fan. 1981 4.7 Euro engine. Sorry I know this has been asked before, but limited internet up here. Thanks guys!
Old 07-12-2017, 11:09 PM
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Dave928S
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Erik ... the size depends on whether you have the smaller fan pulley to give higher fan speed, as the Australian Euros do. If you have option M319 (additional engine cooling for hotter climates) you have the smaller pulley, and need the shorter belt. Here's a thread on the issue which gives sizes .... https://rennlist.com/forums/928-foru...inch-belt.html
Old 07-12-2017, 11:09 PM
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hlee96
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Roger sells them. I think 20-21" by 1/2"
Old 07-12-2017, 11:29 PM
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Erik N
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Default Pulley pics

Main pulley
Old 07-12-2017, 11:32 PM
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Erik N
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Default Air pump pulley

Siezed pump
Old 07-13-2017, 12:18 AM
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76FJ55
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the easy solution would be to go to the part store and pick up both a 4L200 and a 4L210, then return the one which doesn't fit. you will need to remove 3 of the 4 bolts which mount the fan carrier arm and loosen the 4th, so yo can swing it down to install the belt. try the shorter one first, and if you cant get the fan back into position install the longer one.
Old 07-13-2017, 02:07 AM
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Dave928S
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I've found the measurements of the fan pulley, to make it a bit easier. If the overall diameter is 86mm you need the 20" belt, if it's 108mm then you need the 21" belt.
Old 07-13-2017, 02:22 AM
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granprixweiss928
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Originally Posted by Dave928S
I've found the measurements of the fan pulley, to make it a bit easier. If the overall diameter is 86mm you need the 20" belt, if it's 108mm then you need the 21" belt.

thanks
Old 07-13-2017, 08:12 AM
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Fox_
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Originally Posted by Erik N
On the road up in Idaho, my air pump seized. Looking for the belt to connect the main pulley to the fan. 1981 4.7 Euro engine. Sorry I know this has been asked before, but limited internet up here. Thanks guys!
Well, it made it most of the way!

Good luck with fix.
Old 07-13-2017, 03:03 PM
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Care package on the way - twas 21"
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